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The Antennae galaxies
Picture of The Antennae galaxies

NASA, ESA, and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration

This odd-shaped object is actually a pair of galaxies, called the Antennae, caught in the act of merging. Billions of stars are forming from this encounter. The brightest and most compact of the star-birth regions are called super star clusters.